Auxiliary air-valve for carbureters.



A. C. STEWART.

AUXILIARY AIR VALVE PoR GARBURBTBRS.

APPLIOATION FILED 00T. 3, 1911, 1,035,651 Patented Aug. 13,1912.

Taf@ R91 gllY /j 1/8 1 "nimm Miumuur UNITED STATES PATENT oFFioii.

' A'Lljman 0. STEWART, or Los ANGELES, CALIFORNIA;

AUXILIARY AIRf-VALVE FOR CARBURETERS."

To all whom z'tmay concern.'

Be it known thatI, ALFRED C. STEWART, a citizen of the United States, residing at Los Angeles, in the vcounty of Los Angeles and State o-f (California, 'have invented a new and useful Auxiliary Air-Valve for Carbureters, of which the following is a specification.

The object of the present invention is to `providelan auxiliary air valve which may Ibe applied between the inlet pipe of the carbureter with thev minimum displacement of such parts.

Other objects of the invention; appear hereinafter,

The- 'accompanying drawings illustrate an embodiment of the invention and referring thereto: Figure 1 is a side elevation of a portion of an engine, manifold and carbureter therefor, withthe auxiliary air valve and' its controlling means. Fig. 2 is a horizontal section of the auxiliary air valve and its connecting device. Fig. 3 is a sectionon line B-ar in Fig. 2.

1 designates a portion ofaii internal combustion engine, and 2 the manifold for said engine Ahaving an inlet pipe 3. The auxiliary air valve'is connected betweenthe said inlet pipe 3 andthe carbureter 4, the connecting means for said valve comprising a plate 6, having 'extensions 6 to extend between the corresponding extensions 3 `and 4 on the inlet pipe and carbureter, said exy tensions 6', 3v and 4 being perforated to receive the fastening bolts 12, whereby the several parts are clamped together. The plate 6 is formed witha central opening 9 for establishing communication between thc carbureter outlet and the inlet pipe 3, and a channel 7 is provided in said plate extending around or partly around said opening, and communicating with a lateral inlet passa e 8 which extends out through one side of t e plate'in a lateral extension 10, and communcates with the auxiliary air valve. The passage 8 preferably extends tangentially to the opening 9 and the channel 7 tapers or diminishes in width so that the auxiliary air coming from the passage 8 is gradually forced into the opening 9 and at the same time is given a whirling motion. The channel 7 is preferably flat or elongated radially so asto provide the requisite capacity for auxiliaryair, AWhile reducing to a minimum .the required thickness of the plate 6\ andthe passage 7 communicatingl p Specification of Letters Patent.

Application filed October 3, 17911. Serial No. 652,637.

`operation of the valve.

Patented Aug. is, 1912.

sion 10 of the plate 6 is therefore of greater.

thickness than the body of the plate so as to provide for this rounding out of the passage, but as said extension is outside of the flanges of the carburetor and inlet pipe it does not increase the required distance between tlie caibureter and inlet pipe. By providing a flatv late with a Hattened chan-` nel for-the auxi iary air in this manner, I am enabled to introduce the requisite amount of auxiliary air without displacing the carburetor to any material extent. Y'

The auxiliary air valve consists of a cas-l ing 15, having a reduced end portion 14 screwing into the outer end of the passage' 8 aforesaid. In said casing', is mounted -a slidable valve member hereinafter described, connected to and operated by the inner or movable wire 17 of Bowden wire whose outer iexible, tubular casing 18 is secured at one end to the casing 15 and at the other end to a support 19 located in any suitable position, and carrying a handle 20 pivotally mounted on said wire support 19 and connected to the inner wire 17 of the Bowden wire. Said Bowden wire casing 18 may be clamped to the support 19 and casing 15 by set screws 21 and 22. l

The casing 15 for the auxiliary air valve s cylindrical and closed at its outer end by plug 24 screwed into said outer end, said plug being axially perforated as at 25 to receive'the casing 18 of the Bowden wire and the fastening screw 22 beingA screwed into said plug to grip said casing of the Bowden August 25, 1898. The cylindrical-casing 15 is provided with a series of air inlet open-y ings 26 in its side walls distributed along the walls so as to be opened in succession by The valve body 2 is mounted to slide in the cylindrical casing 15 and is connected to the inner wire 17 of i the Bowden wire, said wire being inserted into a bore 27 in said body 27 and fastened .by set screw 28, said body is formed with a conical valve face 29 on its outer end eooperating with an annular lshoulder 30 formed in the casing 15, said shoulder forming a seat for the valve. The ports ico or openings 2K6 are distributed through the range of motion of the valve body and the combining area of these ports may be about the same as that of the reduced portion 14 of the valve casing.

When no auxiliary air is required inl the operation of the engine the valve body 27 is operated by the inner member of the Bown den wire, so as to bring the conical face 29 against shoulder 30 effecting a complete shut off of the auxiliary air. When auxiliary air is required, the valve body 27 is operated by\the controlling handle acting through the Bowden wire, to `move the valve body away from the said shoulder .and longitudinally in the casing 15 to open more or less of the .ports or openings 26 in t-he said easing; tlie'iamunt of auxiliary air admitted being dependent .on the extent of movement of the valve'body. y 4

What I claim is :y

y, 1. The combination with the inlet pipe for an engine, and a carburetenof a flat plate interposed between said inlet pipe and carbureter,` and having -an opening establishing communication bet-Ween said inlet pipe and carburet'er, said flat plate having a channel extending around said opening and provided with a lateral inlet passage opening tangentially into said channel, and an auxiliary air valve connected-'with lsaid lat-' and carbureter, said flat plate having a ehani nel extending around said opening and provided with a lateral inlet passage opening tangentially into said channel, and an auxilf iary air Valve connected with said lateral inletpassage, said channel being of less height than the opening of said lateral'inlet passage and tapering/in width for the purpose v set forth.

In testimonyfwhereof, I have hereunto set my hand at Los Angeles, California, this 26th day of September, 1911.

ALFRED osTEWAR'r. In presence of- ARTHUR P. KNIGT, GLADYS RUSSELL. 

